Sash-holder



(No Model.)

W. L. DEMPSEY.

SASH HOLDER.

No. 413.362 Patented Oct. 22, 1889.

' WMWJQQ N. PETERS. Phmfliilwr, Washington. me

' V UNITED STATES PATENT OFFICE.

- 'WILLIAM L. DEMPSEY, OF WVARSAW, MISSOURI.

SASH-IHOLDERQ.

SPECIFICATION forming part of Letters Patent No. 413,362, dated October 22, 1889.

Application filed April 1,1889. Berial No. 305,780. (No model.) i

'of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to sash-locks, and more especially to that class in which a rack and pinion are employed.

The object I have in View is to produce a more simple, cheap, and eifective lock or fastener than has heretofore been in use.

- \Vith these ends in View my invention consists in the peculiar features and combinations of parts more fully described hereinafter, and pointed out in the claims.

Referring to the accompanying drawings, Figure 1 represents a side elevation, in crosssection, of a' portion of a window-sash provided with my improved lock; Fig. 2, a simi-- lar view showing the window raised and locked in position; and Fig. 3, a sectional View of the lock, taken on line a; x of Fig. 1.

cars or projections 17, by means of which it is screwed or otherwise securely fastened in the sash, and has a recess or chamber D cutout of its interior. The main portion of this recess has substantially the form of a rightangle triangle, its rear wall d sloping back at an angle to the sash. The lower portion of this chamber is made the shallowest. Near the center of the back wall of the recess is formed another smaller circular recess or chamber e. This chamber does. not form an entire circle, a segment. of the same being cut off by the sloping wall d of the main recess. A sliding wedge F is introduced into the main recess and has substantially the form of the same, its lower portion, however, being cut off square at f, to allow a play of the wedge therein. The lower portion of the said angular recess does not come to apoint,

but an abutment Zis formed, against which the squared end of the wedge bears when it reaches the limit of its downward play. The Q either end of the wedge feet 71. h are formed,

which project beyond the plane of the rack g, and by means of which the wedge slides on the sloping wall of the recess. The rack g is engaged by a pinion G, which is contained within the circular recess e. This recess being a segment of a circle, a portion of the pinion will project outjof it and engage the teeth of the rack. On either side of the pinion G are formed trunnions h, which turn in bearings '6, formed in the plates B and 0. Through the center of the pinion a squared aperture m is made for the reception of a corresponding key H, having a head h on its outer end, by means of which it is turned, as

shown more clearly in Fig.

This mechanism just described is covered and confined by the plate 0, which is secured on the main portion B of the lock-casing in any desired manner. The front portion of the lock is covered by an elongated plate or facing 0, having guides 0 0, secured in either end, which slide in apertures 0 0, formed in the plate. B.

The preferred manner of constructing my invention having been set forth, I will now describe its operation. When it is desired to lock the window in position, the key H is introduced into the slot m in the pinion G and turned. The teeth of the pinion engaging those of the rack, it will readily be seen that the wedge will be slid down the inclined plane of the rear wall d, and consequently out of the recess and against the plate 0, and thus force the said plate against the windowcasing and lock the window in position by being wedged between the plate 0 and the window.

It is evident that various slight changes 2. In'a sash-lock, the combination of a 5 Wedge, a pinion for actuating the same, a key fitting said pinion, a separate facing arranged to be forced out by said Wedge, and guides for said facing, substantially as described.

In testimony whereof I affix. my signature in 20 presence of two Witnesses.

WILLIAM L. DEMPSEY.

\Vitnesses:

P. D. HASTAIN, W. J. HUSE. 

